"What kind of vegetarian are you?"

Because being a vegetarian is a very individually-defined lifestyle, a set of terminology has arisen to accommodate the various types of vegetarianism that now exist. These terms essentially define and differentiate vegetarians by what food(s) they exclude from their diets. I personally don't think it's necessary to strictly separate different dietary exceptions or to specifically label your vegetarianism, but in any case it's good to be aware of the various terms and what they mean.

Here are the categories of vegetarianism as defined by the American Dietetic Association:

• Strict vegetarian or vegan: A vegetarian diet that excludes all animal products such as meat, poultry, fish, eggs, milk, cheese and other dairy products.
• Lactovegetarian: A vegetarian diet that excludes meat, poultry, fish and eggs but includes dairy products.
• Lacto-ovovegetarian: A vegetarian diet that excludes meat, poultry and fish but includes eggs and dairy products. Most vegetarians in the United States fall into this category.
• Pescetarian: A semi-vegetarian diet that includes fish, eggs, and dairy but excludes meat and poultry.
• Flexitarian: A semi-vegetarian diet with a focus on vegetarian food with occasional meat consumption.